mayhem unfolded overnight starting with a shooting on the campus of the massachusetts institute of technology in cambridge. that's one mile from where we are standing right now at the scene of the boston marathon attack. >> an officer who was killed on the campus of m.i.t. was killed a short time later, a carjacking took place and a police chase took place after that with reports of explosives involved. during the chase, the transportation authority officer was wounded in a shoot-out and suspect number one was critically wounded and later died at the hospital. we expect a press conference in 15 minutes at the hospital. >> we have drew griffin with us right now on the streets of watertown, massachusetts. again, this is the area right now which is a very active crime scene where people are being told not to leave their houses where it is believed that suspect number two, the man involved in the boston marathon bombings and the man involved in this car chase and manhunt, it is believe this is where he's on the loose. drew griffin? >> reporter: to that end, i just listened to a robocall police ha